drm/radeon: implement tn_set_vce_clocks

This implements the function to set the vce clocks
on TN hardware.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/ni.c

@@ -2554,3 +2554,34 @@ void cayman_vm_flush(struct radeon_device *rdev, struct radeon_ring *ring,
 	radeon_ring_write(ring, PACKET3(PACKET3_PFP_SYNC_ME, 0));
 	radeon_ring_write(ring, 0x0);
 }
+
+int tn_set_vce_clocks(struct radeon_device *rdev, u32 evclk, u32 ecclk)
+{
+	struct atom_clock_dividers dividers;
+	int r, i;
+
+        r = radeon_atom_get_clock_dividers(rdev, COMPUTE_ENGINE_PLL_PARAM,
+					   ecclk, false, &dividers);
+	if (r)
+		return r;
+
+	for (i = 0; i < 100; i++) {
+		if (RREG32(CG_ECLK_STATUS) & ECLK_STATUS)
+			break;
+		mdelay(10);
+	}
+	if (i == 100)
+		return -ETIMEDOUT;
+
+	WREG32_P(CG_ECLK_CNTL, dividers.post_div, ~(ECLK_DIR_CNTL_EN|ECLK_DIVIDER_MASK));
+
+	for (i = 0; i < 100; i++) {
+		if (RREG32(CG_ECLK_STATUS) & ECLK_STATUS)
+			break;
+		mdelay(10);
+	}
+	if (i == 100)
+		return -ETIMEDOUT;
+
+	return 0;
+}

drivers/gpu/drm/radeon/nid.h

@@ -46,6 +46,13 @@
 
 #define DMIF_ADDR_CONFIG  				0xBD4
 
+/* fusion vce clocks */
+#define CG_ECLK_CNTL                                    0x620
+#       define ECLK_DIVIDER_MASK                        0x7f
+#       define ECLK_DIR_CNTL_EN                         (1 << 8)
+#define CG_ECLK_STATUS                                  0x624
+#       define ECLK_STATUS                              (1 << 0)
+
 /* DCE6 only */
 #define DMIF_ADDR_CALC  				0xC00
 

drivers/gpu/drm/radeon/radeon_asic.c

@@ -1838,6 +1838,7 @@ static struct radeon_asic trinity_asic = {
 		.set_pcie_lanes = NULL,
 		.set_clock_gating = NULL,
 		.set_uvd_clocks = &sumo_set_uvd_clocks,
+		.set_vce_clocks = &tn_set_vce_clocks,
 		.get_temperature = &tn_get_temp,
 	},
 	.dpm = {

drivers/gpu/drm/radeon/radeon_asic.h

@@ -694,6 +694,7 @@ int trinity_dpm_force_performance_level(struct radeon_device *rdev,
 void trinity_dpm_enable_bapm(struct radeon_device *rdev, bool enable);
 u32 trinity_dpm_get_current_sclk(struct radeon_device *rdev);
 u32 trinity_dpm_get_current_mclk(struct radeon_device *rdev);
+int tn_set_vce_clocks(struct radeon_device *rdev, u32 evclk, u32 ecclk);
 
 /* DCE6 - SI */
 void dce6_bandwidth_update(struct radeon_device *rdev);